Abstract
The motion of a macroscopic mechanical oscillator – a glass nanostring – has been measured, using a cavity-enhanced optical interferometer, with a sensitivity that is 40 dB below that at the standard quantum limit, forming the most precise measurement of the zero-point motion of a mechanical oscillator yet. The resulting back-action due to the measurement has been observed. A quantum feedback protocol is used to cancel 20 dB of back-action, in a first instance of quantum feedback applied on a mechanical oscillator. Quantum correlations developed between the oscillator and the measuring instrument – light – has been observed. The role of these correlations in quantum-enhanced metrology of weak forces is illustrated, and feedback is used to manipulate and enhance the same correlations.
© 2017 Optical Society of America
PDF ArticleMore Like This
V. Sudhir, D. J. Wilson, S. Fedorov, H. Schuetz, R. Schilling, A. Nunnenkamp, and T. J. Kippenberg
FF3D.6 Frontiers in Optics (FiO) 2016
T. J. Kippenberg, V. Sudhir, R. Schilling, S. Fedorov, H. Schuetz, and D. J. Wilson
JTh3G.3 CLEO: Applications and Technology (CLEO:A&T) 2017
V. Sudhir, R. Schilling, S. Fedorov, H. Schuetz, D. J. Wilson, and T. J. Kippenberg
EA_2_2 European Quantum Electronics Conference (EQEC) 2017